Stuff and the transportation of stuff has a moderate effect on the red stack. Many of the numbers are taken from MacKay and then scaled to a value for the US. These scales are assumed for the stuff portion. Ex) it is assumed that a person drinks 2 beverages out of aluminum cans a day instead of 5. For the transportation portion the UK value is multiplied by a ratio of the US exports in dollars and the UK exports in dollars to get a value for the US.
Sources:
http://www.wisegeek.com/how-much-garbage-does-a-person-create-in-one-year.htm
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